JPS6020478A - Charging method of battery - Google Patents

Abstract

PURPOSE:To prevent overcharge and also prevent deterioration or damage in high rate charge by stopping charge when charge voltage becomes maximum. CONSTITUTION:Charge voltage V(t) of a battery 2 is inputted through a converter 4 to a computer 5, and voltage V0=Vt-alpha obtained by subtracting specified voltage alpha from the charge voltage is stored in a memory. Charge voltage is inputted to the computer 5 every time ts by a timer. Differential voltage beta= V(t)-V(t-1) of charge voltage (t-1) in detection and charge voltage V(t) detected in that time is calculated and added to reference voltage V0. The value of V0+beta is stored in the memory as a new reference voltage V0. Charge voltage V(t) is compared with the reference voltage V0 every time ts. When V0>V(t) is obtained, a stop signal is outputted from the computer 5 to a point (P4), a switch 3 is turned off and charge of the battery 2 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of Industrial Application The present invention relates to a method for charging a rechargeable battery such as an N1-CD battery, and a charging stop mechanism for charging the battery fully (1) (2). (This is related to two things.

(b) Prior art A conventional charging method is disclosed in, for example, U.S. Pat. A potential storage element (memory ode) χ which can always store the maximum value of is used, and charging is stopped when the charging voltage of the battery matches the overvoltage stored in the potential storage element.

However, as shown in Figure 'wJ1 (the charging voltage of a battery charged with nitric acid decreases slightly with a negative slope for about 6 minutes after the start of charging, as shown by the curved line in the figure).

After that, charging progresses gradually (the voltage rises with a positive slope), and the charging pressure reaches its maximum value around the time when the battery is fully charged (the charging voltage reaches its maximum value, and then gradually decreases. The charging voltage begins to drop.In the conventional method, the light was stopped at 8W at the difference point (Pl) between the electrical ratio of the T potential storage element indicated by the broken line B in the figure and the charging voltage of the battery indicated by the curve A. In the case of high-rate charging in which a large current is used to charge the battery in a short time, overcharging occurs after the charging voltage reaches its maximum, leading to deterioration or damage to the battery.

(f) Purpose of the Invention The present invention has been made in view of the problems of the prior art as described above, and is designed to stop battery charging at the point where the charging time (>r) reaches two consecutive maximum value ranges. The purpose is to prevent charging.

2) What is the charging pressure of the rechargeable battery that constitutes the invention? Il' Detection central 'clearance department f11! Functional part (-Memorizes a voltage lower by a predetermined voltage than the charged vehicle pressure after a certain period of time has elapsed from the start of charging as a reference 1i pressure, and detects the charging voltage of the electric current C11 at arbitrary time intervals, as well as the previous detection. The difference voltage between the voltage and the next detected voltage is sequentially added to the reference voltage C2 and stored in the central information processing function unit each time, and charging is stopped when the charging voltage of the storage battery reaches the maximum value. This prevents overcharging.

(1) Embodiment Figure 2 (2) Shows a block circuit diagram of an embodiment of the claimed invention.
) is converted to direct current (-).

(2) is the Hl-ca Ryuchi which can be connected via the power source (1) 1-switch (3). (4) is the analog-to-digital converter (2) and the switch (3). It is connected between the battery +21 (1) and converts the analog voltage of the battery (2) into a digital signal (5)
is a one-chip microcomputer as a central information processing function unit, which manually inputs the signal from the converter (4) corresponding to the charging voltage of the battery (2), and converts the standard '1iLI
an arithmetic circuit section that calculates E'l; a memory section that constantly sets a new reference voltage according to changes in the signal from the converter (4); and a memory section that constantly sets a new reference voltage; It is equipped with a comparison circuit section for comparing pressures and a timer. (6)
is a start switch, and when the battery (2) is set and this start switch is turned on, the switch (
3) is turned on and the charging current is supplied to the battery (2) from the power supply.
The flowchart of FIG. 6 will now be described in detail.

When the start switch (3) is turned on (1-), charging of the second battery (2) starts. At this time, the timer in the microcomputer (5) starts. After 6 minutes, the battery (2) starts charging.
The charging voltage yt of 2) is inputted into the computer (5) (via the two converters (4) and stored in the memory section) as a voltage V.
A tonnage pressure yo=vt-α obtained by subtracting a predetermined voltage α (0.IV in the embodiment) from t is stored. Batteries (2)
) is input into the computer (5) every working time tS (-) using the timer. lt
Differential voltage β=■(tl −V (t −1) Y
This is calculated by adding the reference voltage VOt, and vO+β is set as a new reference voltage vO, and is stored in the memory.

Thereafter, this operation is repeated every time tB.

By the way, the charging vehicle pressure of the battery (2) is as shown by the curved line in Figure 1, and the point P at 41'YJ is
It gradually increases up to 2, but after this point P2, the primary price is 9$-
Two begins to decrease. Therefore, compare the current differential voltage βt with the previous differential voltage βt-1, and if βt≧βt-1, add βt to the reference vehicle pressure vO at the time of previous charging voltage detection. However, when βt is larger than yt-1, the thickest value among the various differential voltages βt, that is, the differential voltage β at point P2
Reference voltage “1” that changes moment by moment with InaX as β
0 (by adding the two, a reference voltage drop curve that intersects the charging voltage at point P5, like curve 0 in Figure 1, is obtained. Then, the charging ratio V ttl and the reference voltage V at any time are
Compare O every time 1M1ts, and VO>VltL!
:Nattatoki ($4 figure point P April Nibunputa (5)
Then, a stop signal is outputted and the switch (3) is turned off to stop charging the battery (2).

(f) Effects of the Invention As described above, the present invention provides a central information processing function unit that detects the charging voltage of a battery to be charged, using a voltage that is a predetermined voltage lower than the charging voltage after a certain period of time has elapsed from the start of charging as a reference voltage. The charging voltage of the battery is detected at arbitrary time intervals, and the difference voltage between the previous detected voltage and the next detected voltage is sequentially added to the reference voltage (2) and the central information is calculated each time. This is stored in the processing function unit and stops charging the battery when the stored voltage becomes higher than the detected charging voltage. Therefore, overcharging can be prevented, and the battery will not deteriorate or suffer from high 1/- high charging Q' as in the conventional Q), and f(, Z+ By multiplying the difference between yJ (the second reference voltage and the photovoltaic voltage and θ) by 5v, it is filled;):
It is also possible to stop the light r' and i after the maximum value CI of the Q pressure has reached -1'+J.

4 The fi:'i shore theory of the eye surface, the Ming figure 1 is from the wood side B11-"lτshiyu side two o (jiru 1:'
2i-1! Nozur, electric voltage and base [; voltage characteristic diagram,
ra20shiyobuU1tsuku1su1roItsuji, g+J3 figure is u[
Showing 11 works - 4 "Florse Yard, Figure 4 Ba Nail ↓ 1N
1 for the partial expansion characteristic of .

(5)...Central Information Processing Agency Department.

Figure 1 TI Toy E (To41N) Figure 2 December 27, 1982 1. Display of incidents 1981 Patent Application No. 128354 2. Name of the invention How to charge the battery He who makes corrections. Relationship to the incident Special license client Name (188) Sanyo Electric Co., Ltd. 4. Deputy manager Address: 2-18 Keihan Hondori, Moriguchi City 5. Subject of correction (1) Claims column of the specification.

(2) Detailed description of the invention in the specification.

6. Contents of amendment (1) The claims of the specification are amended as shown in the attached sheet.

(2) ■ In the third line of page 6 of the specification, the phrase "at the time the maximum value is reached" is corrected to "near the maximum value."

◎ In the 1st line of page 7 of the same book, the phrase ``When the maximum value is reached'' should be corrected to ``When the maximum value is reached.'' ”
Correct the statement "by changing".

■ In the 6th line of page 7 of the same book, the phrase ``It is also possible, but it is possible'' has been changed to ``It is also possible, normal charging, high rate charging,
An optimal charging end point can be obtained depending on trickle charging or the like. ” he corrected.

Scope of claims

Claims (1)

[Claims] (1) Central information processing function unit c''' that detects the charging voltage of the battery to be charged - A voltage lower by a predetermined voltage than the charging voltage after a certain period of time has elapsed from the start of charging is stored as a reference voltage, and the While detecting the charging voltage of the battery, the difference voltage between the previous detected voltage and the next detected voltage is sequentially added to the reference voltage C2 and stored in the central information processing function unit C2 each time, A method of charging a battery, wherein charging of the battery is stopped when the stored voltage becomes greater than the detected charge 1 ratio.